ASTRO-110 Lecture Notes - Lecture 10: Guanine, Cytosine, Thymine
9 Sep 2020
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Document Summary
Cells: microscopic units in which the living matter is separated by a membrane from the outside world. Most of the mass of living matter is in oxygen . However, the functionality and structure of cells is due to carbon. Can bond as many as four atoms at a time. Carbon-chain molecules are organic molecules carbon chain backbones. Have been found in space 20,000 ly away. What are the molecular components of cells. Carbohydrates: source of food energy for cells. Major ingredients of cell membranes can spontaneously form membranes in water. Enzymes: crucial to all biochemical reactions with cells; act as catalysts. Proteins: key evidence for a common ancestor of life. More than 70 amino acids are known, although only 20 are used in all living creatures. What are the major groupings of life on earth. Cells need a source of carbon to build the skeletons of their organic molecules. Organic compounds: e. g. , plants, other animals (heterotrophs)
